Combined typewriting and computing machine



H. 1 PITMAN 1 COMBINED TYPEWRITNG AND COMPUTING MACHINE Filed May 16,1923 5 Sheets-Sheet l I June 17, 1930.

June 17, 1930. H L, PITMAN 1,764,978

COMBINED TYPEWRTING AND COMPUTING MACHINE Filed May 16, 1923 3Sheets-Sheet 2 June 17, 1930. H. L. PITMAN COMBINED TYPEWRITNG ANDCOMPUTING MACHINE Filed May 16, 1923 5 Shees--Sheerl 3 Patented .lune17, 193

P E i FFICE HENRY L. PITEAN, 0F WESTFIELD, NEW JERSEY, ASSIGNOR, BYll/ISNE ASSIGNMENTS,

T0 ELLIOTT-FISHER COMPANY, 0F NEW YORK,

N. Y., A CORPORATION'OF DELAWARE COMBINED TYPEWRITING AND COIVIIUTINGMACHINE vApplication filed May 16, 1923. Serial No. 639,266.

This invention relates to computing machines, and is herein illustratedas applied to an Underwood combined typewriting and computing orbookkeeping machine.

One feature of the present invention is the provision of many lmoredials in a totalizer than have heretofore been found practicable in amachine in which a number is set up on indexing devices preparatory tobeing run into the totalizen v @ne of the diiiiculties in devising atotalizer'capable of computing in sextillions, for

example, is that the ordinary transposition mechanism is adequate foronly a small number of decimal places. This is the mechanism whichcauses the typewriter carriage,l as it proceeds from right to left, toselect the denominations from left to right.

Another dilhculty is the carry-over mechanism, which usually includes ashaft rotated by the general operator, and having spurs thereonsulicient for driving the wheels of an ordinary size totalizer seriatim,but incapable of handling a totalizer of say double such size.

A feature of the invention consists in the provision of means foreffecting the carryover in the register in stages, for example, bysuccessive rotations of a carry-over-completing shaft. Heretofore eachregister in said bookkeeping machine has been limited to about elevencomputing bars, a set of dialwheels, one for each of said bars, and anadditional dial-wheel of higher order receiving l carryovers only fromthe highest order dialwheel of said set. lt will be evident that byeffecting the carryovers in stages, use may be made of registers ofgreater capacity than the one to which reference has been made.

The transposition mechanism may be composed of a plurality of sets oftransposition devices of forms now in use, thus avoiding redesigning ofthe transposition devices and serving other purposes to be brought outhereinafter. Each set forms a unit. These units have a transposedrelation. The transposition devices of each set are actuated bycorresponding sets of jacks, and,

in order to select denominatians from the highest to the lowest inorder, it is necessary disks of the different sets to actuate seriatimfrom right to left the jacks of the left-hand set and then of the nextset to the right. To this end, the forward ends of the jacks of thedifferent sets are 0E- set so that a denomination-selector may firstactuate the left-hand set of jacks seriatim, and, upon the completion'of this operation, another selector may actuate seriatimifhe ofi'- setjacks of the second set. With this arrangement, it is evident that theedective capacity of the register may be varied by throwing theleft-hand selector or selectors out of operation.

To effect .carryover for the sets ,ofdialwheels corresponding to thedifferent sets of computing bars and transposition devices, provisionmay be made of mechanism to eect' carryover in the lirst set ofdial-wheels and then in the second set, and, in case of a greater numberof sets, in the other sets successively. Heretofore, where a single setof computing bars and transposition devices has been used for eachregister the carryover has been completed by a single rotation of ashaft actuated by the general operator onlypin its rearward movement.According to the present invention, the shaft for completing thecarryover must be rotated once for each set of computing bars associatedwith the register. 'To this end, provisionmay be made of suitablemotion-multiplyingmechanism between the general operator and the shaftfor completing the carryover.

As herein disclosed, the shaft for completingthe carryover is providedwith disks having toothed portions or spurs to engage. pinions formingpart of the intermediate carryover elements settable by the dial-wheelsin passing from 9 to 0, the spurs being arranged helically. These disksare provided 'v with obstructions or stops, onel for each carryoverpinion on the intermediate elements, so as to prevent overthrow when anintermediate element is actuated by a dial-wheelv moving from 9 to 0,.The corresponding may be ofthe same shape with one exception, namely,the carryover-completing disk associated with the carry-over pinion ofthe lowest order in a set of higher order (left-hand set) differs may beadvanced ion,

- or projection resting on the periphery of .gap

from the disk of lowest order of the set of lower order (right-handset). This pinion one step before the corresponding disk is brought toits initial osition at the completion of a rotation o thecarry-over-completing shaft, and to permit such advance movement of thepinion, a portion of the associated carr -over-completing disk 'has beencut out. onsequently, the overthrow-preventing obstruction is eliminatedfrom this disk, and to prevent overthrow of the corresponding carry-overpinprovision is made of a pivotally-mounted paw having at its front endan obstruction normally lying in the path of the teeth of the carry-overpinion and at the other end a tooh t e associated carry-over-completingdisk; the

provided to permit rotation of the pinion being extended to a point suchas to permit release of the pawl at the proper time.

. chine.

Other features and advantages will hereinafter appear.- l

In the accompanying drawings,

Figure 1 is a diagrammatic side elevation, partly in section, showingthe invention applied to an AUnderwood bookkeeping ma- Figure 2 is afragmentary front view, partly in section, showing the operatingconnection between the general "operator and the carry-over-completingshaft.

' Figure A3 is a top plan view of the comuter, parts being omitted toshow the underyin structure.v

Figure 4 is a View, from the left, of the dial-wheels and carry-overmechanism, showing theI carry-over-completing disk of the set of lowestorder and the corresponding dial-wheel with its carry-over tooth inposition to actuate the intermediate carryover element in passing from 9to 0.

Figure 5 is a view similar toFi-gure 4, showing the intermediatecarry-over element advanced one step by the carry-over tooth of thedial-wheel and held against overthrow by the carry-over disk of lowestorder.

Figure 6 is ,a view similar to Figure 5, showin the carry-over disk ofhighest order in the rst set in engagement with the correspondingintermediate carry-over element, to carry-over from the dial-wheel'ofhighest order of the first set to the ,dial-wheel of lowest order of thesecond s'et. f

Figure 7 is a View showing the carry-over element after a partialrotation by the dialwheel of the highest order of the lowest set, andthe corresponding carry-over completing disk about to complete thecarrying-overrotation, to the wheel of lowest order in the highest set.

Fi ure 8 is a view similar to Fi re 7, but showing the disk of lowestorder 1n the second set 'in position to permit the intermediatecarryover to be set by the 12th dial, the

vout of enagagement wit disk having a suitable cutout for this Vpurpose.

Figure 9 is a view showing the carr -overcompleting disk of lowest orderin t e first set in the position corresponding to that of the diskFigure 8 and locking the corretion of the lowest or right-hand set ofjacks.

Upon depression of numeral-keys 11 of the typewriter, key-levers 12 actthrough bellcranks 13 to swing type-bars 14 to print against a platen 15mounted in a carriage 16. The carriage 16 is mounted upon front and rearrails 17 and 18, respectively, and is urged to the left by the usualspring-drum not shown. To control the movement oi the carriage 16,provision is made of a rack 19 connected with the carriage 16 andnormall in mesh with a pinion 20 having the usua one-way connection withan escapement wheel 21, which, in turn, is controlled by fast and loosedogs 22 and 23, respectively. As each type-bar approaches its typingposition, a heel 24 thereon engages a unlversal frame 25, therebyshiftin the loose dog 23 wheel'21,.and the fast dog 22 into engagementtherewith.` Upon the return of the actuated type-bar to its normalposition, the fast. dog 22 will be withdrawn and the loose dog 23brought into engagement with the escapement wheel 21, thereby ermittingan advance movement ofthe es apement wheel 2l 1n the usual manner.

The numeral-keys 11, with theexception of i the"0f key, have stems orpendents 26 to depress arms .27 on rock-shafts 28 provided with arms 29connected with linkages 30 to depress bars 31 for setting index-pins 32on computation bars 33.

The pins 32 are normall out of alignment with the bars 31, but, as t ecarriage travels across the machine, a denomination-selectorA 34 israised into eiiective position by a frustoconical roll 35 thereon ridingup on a lifting roller 36. Upon further movement of the carriage, aselector-dog 37 on the selector will engage and cam upwardly lthe frontends of a set of jacks'38, thereby ,rocking the jacks about a pivot 39and depressing links 40 to rock bails 41 supported on a fulcrum- `rod41'* of a transposition dev-ice 42, thereby advancing seriatim the,computation bars 33 of a set corresponding to the jacks 38, so as tobring the pins 32 into vertical alignment with the bars 31. When one ofthe compun tation bars 33 is so advanced,-depression of a plu-setting'bar 31 will set the correspondputer a segment 45 meshin ring to theactive jacks 38, the computation of the number so indexed may beeffected by pulling forward -a handle 43 and then returning it to itsnormal position. This handle is mounted upon the end of a shaft 44having fixed thereon at each side of the comwith an idle pinion 46,which, in turn, mes forming part of a general operator, indicated ingeneral by 48. The forward movement of the handle 43 will effect forwardmovement of the general operator 48 and cause a crossbar 49 thereon toengage ythe lower ends of the-depressed pins 32 and advance the comlbars 33 are provided with Aputation bars 33 distances corresponding tothe numerical values of the digits indexed.

At their forward ends, the computation racks 50 engaging with pinions 51having one-way connecl tions with dials 52, such that the forwardmovements of the computationbars 33 will advance said dials an extentcorresponding to the forward pin-set movements of the correspondingcomputation bars 33, and, upon rearward movements of the computationbars 33, the pinions 51 will revolveA idly with respect to thecorresponding dials 52. Toothed wheels 53 are iixed to the differentdials 52, and coperate with detents 54 urged against them by springs 55,so that the dials will be Iheld in proper sition u on completion of thedrive thereo and will e prevented from l accidental movement during therearward movement of the computation bars 33. Durmg the rearwardmovement of the general operator, carryover between the dials will beeffected by means to be described hereinafter. The mechanism describedso far may be in general similar to that disclosed in my Patent No.1,370,360, dated March 1, 1921.

As herein disclosed, use is made of a register of substantially twicethe usual capacity, and the usual transposed actuation of thecomputation bars 33 is effected by 'using twocomplete transpositionsetsor units side by side, as shown in Figure 3, each set being ofsuiii'ci'ent capacity to control eleven com- Veo putation bars.Obviously, the left-hand `or highest transposition devices 56 must beac- ,f ftuated before the lower vices 42 are actuated.

To operate the elements of the transposition device 56, use is made of aset of thrust links 40 corresponding to those used in con-L nection withthe transposition device 42v and of a set of jacks-59 similar to thejacks 38 but having their forward ends oi'set or elongated forwardly, asshown in Figure 1, to enable them to` be operated independently of thejacks 38. Provision must also be made of an additionaldenomination-selector 60 having es' with a rack 47 transpositiondethereon 'a selector-dog 61 to engage the forward ends of the jacks 59,the selectors 34 and 60 being so ositioned that, as the selector 60completes t e actuation of the jacks 59, the selector 34 will be broughtinto operation on the jacks 38. Usually the length of a lifting roller,such as 36 is substantially thev width of a set of jacks, but in thepresent case it is made of sufficient length to extend from the upperend of the set of jacks of highest order to the lower end of the set ofjacks of lowest order, as shown in Figure 10.

Each dial 52 is provided with a carry-over tooth 62 so positioned thatwhile the dial 52 is movng from 9 to 0 in each revolution,

rthe tooth will engage one of the teeth of a pinion 63 and turn thepinion substantially oneninth of a revolution to start the tenscarryintrain of which the pinion vforms a part.V he pinion may be detained inthe various positions to which itis shifted by means of a spring detentcomprising a ball 64 mounted in a cylindrical opening 65 in a shaft orrod 66 on which the pinion 63 is loosely mounted, the ball 64,/beingpressed outwardly by a spring 67 so as to engage in openings y68provided at suitable intervals in the pimon 63.

The pinion 63 forms part of an intermediate carry-over element whichalso includes a three-toothed pinion 69 to mesh with the toothed wheel53 of the dial of next higher denomination. Each intermediate element,in completing the carryover, is turned altogether'through one-third of arevolution, so that the three-toothed pinion 69 secured thereto willturn the toothed wheel 53 connected with the dial of nexthigherdenomination through one-tenth of a revolution.

To complete the action of the carry-over trains which have beenoperatively set by carry-over teeth 62, provision is made -ofcarry-over-completing means operable by the general operator duringitsreturn movement, and comprising a carry-over-completing element 70 toco-operate with each` pinion 63. The carry-over-completing elements aremounted on a square portion of a shaft 71 rotatably supported by pins 72projecting into openings in the ends thereof. Said pins 72 projectinwardly through the inner ends of 79, forming part of a rotatable part80, 1.'.

comprising also aI pinion 81 meshing with theleft-hand rack 47 of thegeneral operator.

The gear and pinion are so proportioned that the pinion 78 is turnedthrough two complete revolutions. during a stroke of the general wardlyfrom the operator in either direction. The rotatable member 80 ismounted onl a/pivot 82, passing nection between the sleeve 77 and theshaft 71,

comprising a collar 86 fixed on the shaft 71, adjacent the enlargedinner end of the sleeve 77, by means of a screw 87, and carrying a pin88 to engage in a notch 89 in said enlarved inner end of the sleeve 77.

'fhe pin 88 is mounted in a cylindrical opening 90 in the collar 86 andhas a reduced part 91, extendingthrough an opening 92 of smallerdiameter than the opening 90, and a button 93 at its outer end to limitits movement to the left (Figure 2) under the action of a spring 94.During the forward movement of the general operator, the pin 88 will.

be cammed to the right by the inclined surface 95 at one side of thenotch 89, and the shaft will remain at rest. During the return movementof the general operator, the pin 88 will serve to connect the shaft 71with the sleeve 77 to be moved therewith.

The carry-over-completing elements 70 may be in the form of disks havingtoothed portions or spurs 96 arranged helically in successive coils, thecorresponding spurs of corresponding elements 70 of the different setsbeing in alignment. All of the elements 70 of the set of lowest orderare rovided with overthrow stops or shoulders 9 all of which .i are inalignment and are normally positioned (Figure 4) so as to project intowide gaps between the teeth ofthe pinions 63 which correspond tonine-toothed pinions with every third tooth omitted.

As illustrated in Figures 4 and 5, for the carry-over train of lowestlorder, the dial, in passing from 9" t0 0, shifts the intermediatecarry-over element to the position shown in Figure 5, w1th,a tooth ofthe pinion 63 in engagement with' the stop 97. When the shaft 71 isrotated, the stops 97 are withdrawnfrom their effective positions andthe spurs 96 engage the teeth of the operativelyset pinions 63 andadvance them two steps to complete for each the movement of one-thirdI.. of a revolution.

Each element of the first set has a circular dwell-portion 98 extendingfrom the spur 96 to the stop 97 and engaging in the next wide gapbetween the teeth of the corresponding pinion 63, to lock the same assoon as the spur becomes disengaged therefrom. As indicated in Figures 4and 6, the dwellportions 98 of the elements 70 decrease progressivelyfrom that of the diskl of lowest order, shown in Figure 4, to that ofhighest will be seen that the carry-over mechanism for the first set ofdial-wheels is, in many respects, similar to that disclosed in thepatent tto ghornton, No. 1,228,148, dated May 29,

The elements 70 of the second set, or any higher set of elements 70,are, with the eX- ception of the first element of the set, the same asthose of the first set. When the shaft 71 reaches the position shown inFigures 8 and 9, a carryover may be effected from the dial of highestorder of one set to the dial of lowest order of the next set, and ifthis causes the movement of the last-mentioned dial from 9 to 0, thecorresponding pinion will be actuated one step. If, however, the element70 of the lowest order in the highest set, Figure 8, were in the sameposition as the element 70 of lowest order in the first set shown inFigure 9, the pinion 63 would be locked against rotation and thus Itieup the register.

It is desirable to prevent overthrow of the pinion 63 associated withthe element 70 having a cutout 99. To this end, provision is made of apawl ed on a rod 101 supported at its ends in the end plates 102 of theregister, and held against movement along said rod by collars 103 onopposite sides thereof. The pawl 100 has a tooth 104 at its forward endto engage between the teeth on the pinion 63, and a laterally-projecting tooth 105 at its rear end to co-operate with the dwell 98 on thecorresponding member 70, the cutout 99 being of such length that, whenthe shaft 71 is turned from its normal position, shown in Figure 7, tobring the spur 96 thereon into engagement with the teeth of the pinion63, the pawl 100 will ride off the end of the dwell-portion 98, therebyreleasing the pinion 63. As soon as the spur 96 passes the tooth 105,the latter will again be engaged by the dwell-portion 98 and the pawlshifted into effective osition. The inclined forward face 106 o the pawl100 obviates any interference by the pawl 100 with the movement of thespur 96.l

The spurs 96 and the carry-over-completing elements 70 of each set arespaced about 27 degrees apart around the shaft 71, so that the elevenspurs 96 of the first set of elements will extend through 297 degreesaround the shaft 71. It will be seen that, if the helically-arrangedspurs 96 were continued in this order around the shaft 71, the 13th spurl the highest spur ofthe first set and the low'- est spur of theAsecond' set, thus providing, in connection with the cutout 99 in thefirst 100, pivotally mountmeagre element 70 of the second set, forcarryingover from the rst set to the second set. Ample time will thus begiven for such carryover before the second set of elements 70 of thecarryover-completing means is brought into operation. i

From the foregoing it will be understood that the register comprises anextraordinary number of dial-wheels arranged in denominational order;that there is provided a series of computing bars, one for eachdialwheel, said computing bars being divided into two groups; that for apin-set machine of this character'there is associated with the computingbars indexing mechanism to set up a number thereon; that thedenominationselecting mechanism is divided into two groups, the firstgroup of lower order and the second group of highergorder, each groupcomprising a set of transposition-devices; that there are providedtwosets of jacks, one set for each set of transposition-devices; that thereare provided two selectors on said carria e, one for each set of jacksto actuate sai jacks; and that said selectors are arranged so that thejacks of the second group of denomination-selecting mechanism are ac-''tuated, first by one of the selectors, and that the ,other selectorbecomes subsequently effectlve to actuate the jacksl of the first groupof denomination-selecting mechanism to actuate the computing bars so asto setup on the computing bars a number comprising an extraordinarynumber of digits. It will frther be understood that the registercomprises a carry-over device having a plurality of carry-over elementsarranged in more than one coil of a helix; and that the general operatordrives the dial-wheels on its forward stroke and actuates on its returnstroke the carry-over device through suitv able means to rotate saidcarry-over device through more than one revolution to el'ect all of the.carry-overs of the extraordinary number of dial-wheels from the lowestto the highest denominational order.

Variations may lie-resorted to within the scope of the invention, andportions of the improvements may be used without others.

.Having thus described my invention, l claim:

1. In a computing machine, a series of denominational dials, a series ofcarry-over elements, each settable by a dial for actuating the dial ofthenextfhigher denomination, and

a rotatable carry-over-completing device effective on said elements insuccessive rotations to effect carryovers between successive groups ofdials.

2. In a computing machine, a series of denominational dials, a series ofcarry-over elements, each settable by a dial for actuating the dialofthe next higher denomination, an a rotatable carry-over-completingdevice eff fective on said elements in successive rotations to el'ect`carryovers between successive groups of dials, and comprisingcarry-overcompleting members having actuating spurs arranged in aplurality of helical coils.

3. In a computing machine, a series of denominational dials, a series ofcarry-over elements, each settable by a dial for actuating the dial ofthe next higher denomination, and a rotatable carry-over-complet-ingdevice effective on said elements in successive rotations to effectcarryovers between successive groups of dials, and comprisingcarry-over-completing members having actuating spurs arranged in aplurality of helical coils and aligned stops associated with all of saids urs, except the first in the second helical coil, or preventingoverthrow of said elements by said dials, the one overthrow stop beingomitted to permit a carryover from the dial associated with the lastspur of the first helical coil to the dial associated with the firstspur of the second helical coil. A

4. ln a computing machine, a series of denominational dials, a series'of 4carry-over elements, each settable bya dial for actuating the dialof the next higher denomination, and a -rotatable carry-over-completingdevice effective on said elements in successive rotations to effectcarryovers between successive groups of dials, and comprisingcarry-over-completing disks having operating spurs arranged in helicalcoils, aligned overthrow stops for all but the one having the first spurin the second helical coil, and dwell surfaces extending from the spursto the stops to enga e said carry-over elements after actuation y thevspurs and lock them until said overthrow stops are brought to theirnormal positions. 5. ln a computing machine, a series of denominationaldials, a series of carry-over elements, each settable by a dial foractuatin the dial of the next higher denomination, and a rotatablecarry-over-completing device effective on said elements in successiverotations to effect carryovers between successive groups of dials, andcomprising carry-over-completing disks having operating spurs arrangedin helical coils, aligned overthrow stops for all but the one having thelirst spur in the second helical coil, dwell surfaces extending from 1the spurs to the stops toengage said carryover elements after actuationby the spurs and lock them until said overthrow stops are brought -totheir normalpositions, and an overthrow pawl to engage the carry-overelement associated with the disk on which the stop is lacking.

6. ln a computing machine, a series of denominational dials, a series ofcarry-over elements, each settable b a dial for actuating the dial ofthe next h1gher denomination, and a rotatable carry-over-completingdevice edective on said elements in successive rotations to eliectcarryovers between successive groups of dials, and-.comprisingcarry-overin the second helical coil, dwell surfaces extending from thespurs to the stops to engage said carry-over elements after actuation bythe spurs and lock them until said overthrow stops are brought to theirnormal positions, and an overthrow pawl to engage the carryover elementassociated with the disk on which the `lstop is lackin thelast-mentioned disk having a circular well portion to engage the pawland lock it in effective position until the disk is rotated to theposition in which actuation of the carr -over element may be eiiected bythe dial o next lower denomination.

7. In a computing machine, the combina- A tion with dials, each yhavinga carry-over l pinion but with every tooth,

a member for effecting a carry-over from one of said dials to the dialAof next higher denomination, comprising a pinion having teethcorresponding to a nine-toothed third tooth omitted, said carry-overmember being advanced one step bythe carry-over tooth of the dial ofnext lower denomination when the dial passes from 9 to 0; means to lockthe carryovei` member against overthrow by the next lower dial,comprising a pawl having a tooth projecting into one of the wide gaps onthe periphery of the pinion; and a carryovercompleting disk having aspur to engage a 35' tooth of the pinion after the pinion has beenadvanced'one step by the next lower dial, and advance the pinionsuiciently to complete the carry-over, said disk having a circular dwellat its periphery to engage in one of the wide gaps in the pinion to lockthe same to prevent overthrow after the spur has acted on the pinion,and serving also to engage one end of the pawl to lock it in engagementwith the pinion; the disk being cut away so that when the spur is movedinto engagement with the pinion the pawl will bereleased. A

. 8. In a machine of the class described, a rotary device comprising aplurality of carry-over-completing spurs arranged in successive coils ofa helix.

9. In a machine of the class described, a rotary device comprising aplurality 'of carry-over-completin spurs arranged in successive coils ofa he ix, a series of locking dwells associated with said spurs,respectively, andan overthrow-preventing device controlled by eachlocking dwell associated with the first s` ur in a helical coil ofhigher order than the rst. 4

10. In a machine of the class described, a rotary device comprising aplurality of carry-over-completing spurs arranged in successive coils ofa helix, the angular interval betweenthe last spur of one coil and thefirst spur of the next coil-being greater ,rotary device than theuniform intervals between `successive spurs in any of the coils, toenable a carry-over to be effected from the dial of hi hest order of oneset to the dial of lowest ortgier of the next set before effecting thenext carry-over action on the second set.

11. In a machine of the class described, a rotary device comprising a.`plurality of carry-over-completing spurs arranged in successive coils ofa helix, a series of locking dwells associated with said spurs,respectively, a series of overthrow-stops associatedk with said spursexcept the first s ur in each helical coil of higher order than t efirst, and an overthrow-stop-device controlled by said to be effectiveand ineffective in accordance with the rotary position of thelast-mentioned spur.

12. In a machine of the class described, a rotary device comprising aplurality of carry-over-completing spurs arranged in successive coils ofa helix, and a series of locking dwells associated with said spurs,respectively; the angular in erval between the last spur of one coilany, the first spur of the next coil being greater than the uniformintervals between successive spurs in any of the coils, to enable acarry-over to be effected from the dial of highest order of one set tothe dial of lowest order of the next set before effecting the nextcarry-over action on the second set.

13. In a machine of the. class described, a register comprising aplurality of dials, a carry-over member settable by one of said dials toeffect a carry-over to the dial of next higher denomination, ac'arry-over-complet-V ing member to complete the carry-over movement ofsaid carry-over member, and a pawl controlled by saidcarry-over-completing member to prevent overthrow of the carryovermember by the dial of next lower ldenomination. v

14. In a machine of the class described, a register comprising aplurality of dials, a rotatable carry-over member settable by one ofsaid dials to eiect a carry-over to the dial of next higherdenomination, a rotatable carryover-completing member to complete thecarry-over movement of said carry-over mem-l ber and to lock it a ainstoverthrow, and

means controlled by said carry-over-completing member for preventingoverthrow of the carry-over member by the dial of next lowerdenomination, the overthrow preventing means being maintained ineffective position until the carry-over-completing member is advanced toa position to actuate the carryover member.

15. In a computing machine, the combination of a series of carry-overpinions, two sets, of carry-over completing sectors arranged insuccessive coils of a helix, locking dwells associated with saidsectors, and overthrow-prevent-iondevices associated with all of saiddwells, `the overthrow-prevention devices of all of said dwells exceptthe one of lowest order in the second set being formed on said dwells,the overthrow-prevention device associated with said dwell of lowestorder being separately supported and controlled by its associated dwell.

F16. In a computing machine, the combination of two adjacent dial-wheelsarranged in denominational order, a carry-over pinion settabl by thedial-wheel of lower denomina- .tional"\order, a revoluble element toactuate f said pinion after it has been set to revolve the dial-wheel ofhigher order through one digit position, and means comprising a pivotedelement to be engaged by said revoluble element to prevent possibleoverthrow of the carry-- over pinion when said pinion is actuated by thedial-wheel. l

. '17. In a computing machine, the combination of two `adjacentdial-wheels arranged in denominational order, a carry-over pinionsettable by the dial-wheel of lower denominational order, a revolubleelement comprising a shaft and a sector on said shaft to engage saidpinion, after it has been set, and further actuate it to revolve thedial-wheel of higher order through one digit position, a disk on saidshaft, and means comprising a pivoted element to be engaged by said diskto prevent overthrow of the carry-over pinion when said pinion isactuated by the dial-wheel.

18. In a computing machine, the combination of two adjacent dial-wheelsarranged in denominational order, a carry-over pinion settable by thedial-wheel of lower denominational order, a revoluble element compris-Vdisk on said vand a dwellon its periphery, and means coining ashafta^nd ay sector on said shaft to engage said pinion, after' it hasbeen set, and further actuate it to revolve the dial-wheel of higherorder through one digit position, a shaft, said disk having a cutoutprising a4 pivoted element engaging said dwell to prevent overthrow 'ofthe carry-over 'y pinion when said pinion is actuated by a dialwheel,said pivoted element being capable of engaging in the cutout of saiddisk to render said pivoted'eleinent inedeotive, so that the carry-overpinion may be rotated freely by said sector.

19. ln a register for a machine of the class described, the combinationof a rotary device comprising two groiips of carry-over completingelements, said groups arranged in successive coils of a helix, the firstgroup containing the overthrow completin elements of llowerdenominational order, t e second group containing those of higherdenominational order, overthrow-prevention devices associate'dmith 'allof the carry-over completing elements except the one associated with theelement of lowest order in the second group, said carry-over completingelements being connected to said overthrow-prevention f puting machineof the devices, and a separate overthrow-prevention device associatedwithsaid element of lowest order, the last-named overthrow-preventiondevice being individually supported and controlled by said lowest orderelement.

20. In a computing machine, the combina-- tion bf carry-over pinions, ashaft, a plurality of carry-over completing disks to co-operate withsaid pinions, said disks comprising two groups on said shaft, the firstgroup containing carry-over completingdisks of lower denominationalorder, the second group containing those of higher denominational order,said disks having teeth thereonarranged'in successive coils of a helix,all of the carry-over'completing disks except the one of lowest'order ofthe second set having an overthrow-prevention stop thereon, said stopsto co-operate with the carry-over pinions, and a separate support forthe overthrow-prevention stop associated with said lowest order disk.

21. ln a combined twpewriting and computing machine of the characterdescribed, the combination of a register including a great multiplicityof dial-wheels, a carry-over devicecomprising a plurality of carry-overelements arranged in more than one coil of a helix, a series ofdial-driving elements, indexing devices on said dial-driving elements,mechanism to enable a number to be set up on said dial-driving elementsby said indexing devices, a general operator to actnate the dial-drivingelements after the number has been set up, and means actuated by thelgeneral operator to subsequently revolve said carry-over' device throughmore than one revolution to effect all of the carry-overs for thedial-wheels from lowest to highest denominational order..

22. ln a combined typewriting and comclass described, having a registerthat includes a great multiplicity of dials, denominational deviceshavin index-*devices in which digits may be in eXed and a generaloperator to run numbers so indcxed into the register, a set ofintermediate carry-over devices, said set of intermediate carry-overdevices forming a helical row of a plurality of convolutions, eachcarry-over device settable by a dial to actuate the next higer dial, amultif lle-revolution rotary carryover-completing e'vioe, nectionbetween the carry-over-completing device and said general operator tooperate the carry-over-completing device during a and a one-way con-`ico lil() movement of the general operator, to comwheels,

HENRY la PITMAN.

